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GM patent reveals new two-stage turbocharger

Modern turbochargers may be some of the best ever made, but performance is something that engineers are always trying to improve. According to GM Inside News, General Motors (GM) is hoping to alleviate some of the negative aspects of a two-stage turbocharger setup with a newly-patented design. The patent, that was filed on May 19, 2016, reveals a clever bypass system that allows the engine, a four-cylinder unit, to optimize both the low-pressure and high-pressure inlets for its respective functions. According to the filing, a conventional two-stage turbocharger setup is engineered to allow both turbines to operate simultaneously at low and mid engine speeds. At high engine speeds, only the low-pressure turbine works. The setup can't isolate either the low or high pressure side, which can impair low-end performance. GM's new two-stage turbocharger setup looks to eliminate this by linking the high-pressure turbo to the exhaust manifold through the high-pressure inlet duct. The low-pressure turbo is attached to the high-pressure turbo by a low-pressure inlet duct, which is linked to a connecting channel. A single actuator that is housed in the exhaust manifold creates a bypass that can opens the high-pressure inlet or close the connecting channel. Depending on what the engine load and speed is, the ECU guides the actuator—a single rotating spindle with discs corresponding to flanges on the high and low pressure sides—to isolate one of the two turbos. Isolating the turbos allow the respective inlets to be engineered for the best possible fluid dynamic performance. The setup should increase performance and decrease lag. There's no word on what car this setup will make an appearance on, but it will most likely be used in premium vehicles before trickling down to the rest of GM's vehicles. Related Video: News Source: GM Inside News, AutoGuide via GM Authority Cadillac Chevrolet GM Technology Sedan turbo patent engine turbocharging

Cadillac Escalade gets $5,000 discount to ward off Lincoln Navigator

General Motors apparently isn't going to let early good reception for the redesigned Lincoln Navigator steal thunder from its own luxury SUV without a fight. It's offering a $5,000 discount on the purchase or lease of the Cadillac Escalade this month to any buyer who trades in a 1999 or newer Lincoln model, Bloomberg reports. GM spokesman Jim Cain told Bloomberg the incentive is being offered to keep prices competitive for the Escalade. The 2018 Navigator starts at $72,055, compared to $73,995 for the Escalade, but the outgoing version of the Navigator is selling for an average of around $53,000, compared with more than $80,000 on average for the Escalade, he said. The Escalade was the top-selling domestic luxury SUV in October and No. 4 in the segment, according to Motor Intelligence. It far outsold the Navigator, which last saw a refresh in 2015 and a full redesign in 2007. But Ford is hoping to gain back some ground with the new Navigator and updated Expedition, which also trails the Chevrolet Tahoe and Chevy Suburban in its segment. Bloomberg notes that one Morgan Stanley analyst estimates that GM owns a $2 billion annual pretax profit edge in the lucrative luxury sport utility segment. Our recent First Drive review called the new Navigator "far superior to its primary competitor, the Cadillac Escalade."Related Video:

Here's what else you could buy for the average new-car price of $40,573

Autoblog may receive a share from purchases made via links on this page. Pricing and availability are subject to change. The average price of a new car in America hit a new record in December 2020: $40,573. Not that we're surprised — the average has been over $35,000 for the past few years — but seeing that baseline figure crest 40 large is still a sticker-shock to the system. So, as we do every once in a while, we put our collective heads together and came up with a list of alternatives that you could choose to buy for that sum, new or old, classic or practical. Now, let's be crystal clear about one thing here. We're not actually recommending you make this type of decision. That said, we wouldn't blame you if you did. Managing Editor Greg Rasa: $40,000 will buy a fully loaded Camry or moderately equipped crossover. Or, for $39,997, to be exact, one could go motoring in a fine British automobile. This 2006 Aston Martin DB9 Volante in Alabama has 21,452 miles on it, and depreciation has worked its cruel magic: It is listed for less than one-quarter of its $168,000 starting MSRP when it was new. A check of other used DB9s nationwide indicates this is a fair price. This Aston's CarFax reveals two owners. (One, really, as the second was a dealership. Looks like it got traded in for a Porsche.) If you're understandably concerned about reliability, its service history indicates no surprises to date. Remember, it has a 450-horsepower 5.9-liter V12. And spring is coming. Of course a used Aston Martin is riskier than a new Camry. But as Louis Prima sang, "Enjoy yourself, it's later than you think." What price beauty? Less than $40 grand. Associate Editor Byron Hurd: This price point opens up a ton of options in the "nearly new" luxury space, including a few good enthusiast picks, but my nod here goes to the Cadillac ATS-V. The discontinued, M3/M4-rivaling, 465-horsepower sport sedan and coupe can be had all day long in this price range with low miles. In fact, the real challenge is finding one in the spec you want, since it's one of those old-fashioned cars that actually presented the buyer with choices. Here's a clean, six-speed sedan in an actual color for less than our target price, for example. Coupes are more plentiful than sedans, especially in interesting colors, but there are plenty of them out there.